Supplicatio

Supplicatio in ancient Rome was a solemn thanksgiving or supplication to the gods decreed by the senate: all the temples were opened, and the statues of the gods placed in public upon couches (pulvinaria) to which the people offered up their thanksgivings and prayers. A Supplicatio was decreed for two different reasons: ...
Found on http://en.wikipedia.org/wiki/Supplicatio

supplicatio

in Roman religion, a rite or series of rites celebrated either as a thanksgiving to the gods for a great victory or as an act of humility after a ... [1 related articles]
Found on http://www.britannica.com/eb/a-z/s/188
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